PostgreSQL cluster with VIP

Context

Dependent services needed a stable database endpoint and an architecture designed to reduce the impact of node failures.

Responsibility

Direct involvement in the design, implementation and troubleshooting of the cluster solution and its integration with consuming services.

Architecture

Multiple coordinated PostgreSQL nodes and a virtual-IP mechanism that maintains a consistent endpoint for applications.

Implementation

Node preparation, replication and access configuration, failover testing, and documentation of operations and recovery.

Challenges

Avoiding rigid dependencies, validating behaviour during failures and retaining enough observability to diagnose cluster state.

Outcomes and lessons

More resilient access for related services and clearer procedures for operating and reviewing the platform.

High availability does not end when a cluster is deployed: it requires testing, monitoring, documentation and recovery practice.